Device for recording sound on film



Nov. 3, 1931. H, DE VRY 1 1,829,791

DEVICE FOR RECORDING SOUND ON F ILM Filed Sept. 27, 1930 Patented Nov.3, 19 31 f HERMAN A. DEVRY, or CHICAGO, IILLINQIs', AssIeNoR r0 Q. It;S.'-DE VRY CORPORATION,

or CHICAGO, ILLINoIs, A "CORPORATIONVOF LLINoIs- 'DEVICE FORnnoonnmesounn 01v FILM 4 Application as septemte 27 ,'193c. Serial jm.484,751.

' The invention relates generallyto devices for recording sound, Moreparticularly the, invention relatesto those devices which are eral viewsv operated. electrically and are adapted to record orproducesoundmarkings on sensitized mo- 1 tion picture film of the typethat isused'in apparatus for effecting the synchronous rep production oflightand sound effects.

The object of the invention is'toprovide device of "theaforementionedcharacter which is comparatively simple in construetionand operates, in a novel and improved 9 manner to record or produce asound marking on the sensitized film; In general, this device comprisesanfincandes'cent lamp, the bulb part of'which is opaqueexceptfor aminute slit i slee end thereof. The lam is adapted to be positioned withrespect to feed ing or winding mechanism for the, film so that the beam'of light'emanating from the slit strikes against one of the sidemargins ofthe'fihn and forms on the film, as the lat- .ter is driven. bythe feed mechanism, an exposed portion of strip-like conformation.

, Thejbase of the lamp: is connected to an;electrically actuatedvibrating unit whlch 18 asfso'ciated with an electriccircuit or systemof fthetype thatincludes amicrophone and produces current impulses "thatcorrespond to y the waves or vibrations of the sound that is i ,r toibe"recorded and] later" produced. The

, "aforesaid unit, when operated, vibrates the lamp differentially andcorrespondingly't'o the current impulses 'w-ithjthe result-that [thebeam light radiating from the lamp exposes the marginal partofjthe filmm such a manner that said part, when the filmais develop'ed, embodies azigzag or, jagged mark-Y, -ing,}thejfp,ointed parts of which ,vary inlength and spacing in accordance with the magniia de' and rapidity ofthe lamp-vibrar 'tions and serveias an accuraterecord of the '.soundsthat-arejtransmitted to the micro- I phone of -theelectrical circuit orsystem the .vibrating unit; 7 1 I Theinventionconslsts in the severalnovel features whichare hereinafterset forth and r are more particularlydefined by theclairns at the conclusion hereof; j i p l l V In thedrawingswhich accompanies and -ogra'phs I and has punched or otherwiseito support the film ,fso, that one ofthe marigure' l'is'a diagrammaticview of a sound recordlng device embodying the invention;

Figure 21s an enlarged sectional view of 1 the electrically actuatedvibrating unit'for the incandescent lamp; 1

Figure 3 is a view, partly in section and partly in elevation, of thelamp for making I the sound record on the film;

Figure 4 is a bottom view of the lamp; and Figure 5 is a perspective ofa developed film fthathas been subjected to the action of the, soundrecording device. n

' The device which forms the subject matter ofthe'present inventionisadapted primarily for main recording sound on a sensitized film f of thetype that is used in cinematformed' in the side margins thereof holes ffor receiving the teeth of sprocket wheels or "like driving elements.Said device comprises an incandescent sound recording lamp 5which-consistsof abase 6 and a glass bulb 7. The baseof the lamphas oneend thereof joined to the bulb. The other end'of the base is providedwith a' reduced stem'8. Thebulb is cylindrical with theexception oftheouter or'tip portion 7 which embodies a pair of walls 7}. Th'e'latterconverge 'and jom each other in aj-straight edge 7. In addition to thebulb and bas e,fthe lamp comprises a filament9, the major or operativeportion of which is disposed in thebulb 7. One end of {the filamentextends through the base and stemand is grounded in any suitable manner.

The other end of the filament 9 projects *through 'the sidepart of thebase and is aldapt edfto be connected by a flexible elec- T90tricallconductor10to, a source of electric current having a constantvoltage. The lamp .5 ispositioned' adjacent a'pair' of sprocket wheelsllj and 12. The latter are adapted ginal-parts thereof engages the edge7 of-the bulb, and operate, during drive thereof, to

, feed theifilm longitudinally and'relatively to the lamp. The sprocketwheel 12 is driven 'n anau marking 'on thefilm tobe made inthe form T ofa straight line, as indicatedin Figure 5.

device will be as follows:

7 The electrically actuatedvibrating unit '18 will be subjected toelectrical impulses cor responding in magnitude and number to the vvavesof the sound that is tobe recorded.

*These impulses operate as previously described to vibratedifferentially. theholder 7 element 27 and the lamp. The beam of lightradiating fromthe lamp through the aperture l6 strikes againstthe movingstrip of film andby reason of the fact that itis oscillated or movedback and forth responsively to the action of the unit 16, it exposes thefilm so that the latter, When developed, has an accurate zigzag orjaggedsound marking thereon. fUpon completion of the sound recordingoperation and the development of the film 7, said film may be used inany suitable apparatus for effecting thesynchronous reproduction oflight and soundefi'ects. In

4 view of the fact that the edge 7 of the lamp 7 tion of the film whichis exposed is the portion 7 5 engages or is in oloseproximity to thefilm during the recording operation, the only poragainst which the beamof lightstrikes.

The sound recordingdevice herein .dis-

closed consists ofbut a small number of parts andconsequently may bemanufactured at a comparatively low cost. It isextremely efficient, asfaras operation is concerned, and may be operatedeconomically.

The invention is notto be understood as restricted to the detailssetforth, since these may be modifiedwithinthe scope-of the appendedclaims, Without departing from the spirit and scope of the invention,

This application is'a continuation in part of anapplication filed byme'June 26, 1929, Serial N 0. 373,821. Y

- Having thus described the invention, What i I claim as new and:desire'to secure by Letters Patent, is: r I

l. A device for recording sound markings on a light sensitive movingpicture film, comb ct tdted-tobpnsmg com um Ion a mu 1011 alightsensitive'movlng plcture film, comconnected to an electrical systemwhich produces current impulses corresponding to the I aves orvibrations of the sound that is-to be 7 recorded, and embodying avibrating element that'is actuated by such impulses; means for feedingthe film relativelyto the unit; and a lamp connected to and vibrated bythe element, said lamp being so arranged that when thefunit and,feedmeans are operated the light emanating from said lamp strikesagainst the film and exposes thereon a sub- 'stantially zigzag or jaggedmarking ture, strikes against vthe film and" exposes devicafen recordinsound mar in s oniarseusitized moving pi tu efilm, 0I Pfi$= ing onzanitr dapt d to e ca neetedrto an1ele rica z y t hp fl c ii rt nt mpueswrespQ i atoth Waves QnaibratiQas-Qfth sound tha i o be reco d ed andembpdying a vibrating element that is act ated bnsuch mpu means o feed:ngfithfi film relat v ly t he unit; v d mp canuee dto an v b a ed; y hment, h bulbgof; saidglamp be ing opaque except for a minute; apertureand being: so iarranged that vahen @the-nnit; and. feed; meansv areoperated the eambf flight em nat ng rom ai pe 8.0 here n? aa ub tantia yz g g or Jagg d mi ifkingui y a 3. A; devi ce; for recording soundmarkings onaisepsitized moving picture film, comprising in combination aunit adapted-to be conneQtedt-o e ectrical zsyst lwhi P odcurrent-impulses, corresponding to the waves or v-ibratlonsyofthe soundthat ls-to be resettled, an embody ng ti g ment v thatis act u;1 Billbysucli impulses; means :for mfeedinggthe film relatively; to the unit;and a lamp, con e ted to; nd v brat I y the el ment-,the bulhof saidlamp being provided with; an .a-perturedopaqueshell and being soarranged, that when the unit and feed means {195 Litre operated: the;beam; of .light emanating .frp'mtheaperture in the shell strikes againstthe film nd; exposes-thereon a substantially Zig a ,Qm-jaggedma k ag: IA- devlcei o re'co g sound m rki g 'Qn alse a t .Ze v ov ngup c e film,mpr slng m combmat on a un t adapted to be connected electricalsystemwhich produces currentz mpulses r spond g o he W ves or vibrations ofthe sound, thatis to be rtecorded, and embodying vibrating elementthatis actuated by such impulses; means for feeding the film relatively tothe unit; and a lamp connectedto and'vibrated by the element, the bulbof said lamp being rendered opaque by a metallic plating having anaperture therein, and being so arranged that when the unit and feedmeans are operatedthe beam of light emanating from'the aperture strikesagainst the film and exposes thereon a sub-@ stantially zigzag or jaggedmarking.

5. A devicev for recording sound markings prising in combination a unitadapted to be connected to an electrical system Which prow duces currentimpulses corresponding to the Waves or vibrations of the sound that isto be 7

